Mystery housemate walks out of Big Brother house

Was Nathan fed up with the house?
Was Nathan fed up with the house? Paul Broben

A BIG Brother housemate has walked off the show.

Social media is tipping Nathan as the dearly departed housemate, with one Twitter users claiming to have spotted him smoking at Dreamworld yesterday during a ride on the park's steam train.

All will be revealed on tonight's show, with the Big Brother live feed suspended to build anticipation.

Nathan, the male intruder whom the public voted to keep in the house, had admitted to having issues with coping with the isolation of the show last week.

But Wednesday's evictees Katie & Lucy, the ever-positive Sugar Sisters, seemed to think he was doing alright.

"We've chatted to Nathan and we absolutely love him," Katie said.

"He's really down to earth and we had lots of fun with him. I think he's coping really well."

The show's official Twitter handle said one housemate has "sacrificed themselves for another" and that their identity will be revealed on tonight's show, which airs at the later time of 8.45pm because of a delayed broadcast of Australia's Got Talent following yesterday's NRL grand final.

Producers wouldn't reveal much more, except that the surprise departure is not made by dog George Clooney.

One of the two female intruders, Madaline and Boog, is also supposed to be booted off the show tonight.

Topics:  big brother editors picks

MISSING: Police appeal for help to locate three teens

Police are searching for information to find three missing children who are believed to be travelling on the North Coast.

Concerns held for welfare of missing children

New degree to help fight against floods

Effects of floods will be studied at Southern Cross Univeristy

University degree was threatened due to Federal Government changes

HEAT STRESS: Should work stop when the heat is on?

CFMEU campaigns for relief from heat

Local Partners

Stone the flamin’ crows: Home and Away actor's new project

HE’S played the iconic Alf Stewart for 30 years — but now, Home and Away’s Ray Meagher is working on a new project.

Audience member shocked penis puppeteer

Rich Binning and Barry Brisco from Puppetry of the Penis.

It takes a lot to shock Rich Binning who appears nude on stage

What’s the greatest 1980s movie ever?

That lift, featuring Patrick Swayze and Jennifer Grey, back when she had a normal nose.

From Dirty Dancing and Crocodile Dundee to Die Hard

Jennifer Lawrence flaunts her nudity on set

Actress Jennifer Lawrence attends the premiere of "Red Sparrow" at the Newseum on Thursday, Feb. 15, 2018, in Washington. (Photo by Brent N. Clarke/Invision/AP)Source:AP

Jennifer Lawrence so comfortable on Red Sparrow set, she went naked

Bardot’s biggest secrets finally revealed

L-R: Belinda Chapple, Tiffany Wood, Sally Polihronas, Sophie Monk and Katie Underwood made up Bardot.

Popstars girl group Bardot’s biggest secrets finally revealed

How three Aussie movie-makers lured Helen Mirren

Jason Clarke and Helen Mirren in a scene from the movie Winchester. Supplied by Studiocanal.

It took a lot of work for three Aussies to lure the Oscar winner

Roxy Jacenko: ‘I came over all hot’

Roxy Jacenko and Oliver Curtis have talked about their sex life since his prison release last year. Picture: Aaron Francis.

The pair gave revealing interview about their lives since his release